The cruise control on my 1996 Dodge Ram 2500 w/ cummins engine behaves irratically. The problem has been getting worse over the last several years and is nearly impossible to use in cold weather. On the first set it engages and SLOWLY accelerates 10 to 15 mph (it takes a minute or 2). It then realizes it is going too fast and even more slowly decelerates to the speed I set it at. If I am lucky at this point it works like it should. If I interrupt this cycle it will not stay at the set speed...until I let it complete its accelerate/decelerate cycle mentioned above. About 5 years ago I had a dealer diagnose the problem. They said a bad computer. I couldn't see dumping $500+ into fixing the cruise, so I got a used one from a bone yard. The symptoms did not change so either this was not the problem, or the part I purchased had the exact same one!
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www.cumminsforum.com > ... > 3rd Gen. Powertrain Jun 5, 2010 - 9 posts - 7 authors
I have an 06 Dodge 5.9L that has a light white smoke and rough idle when first ... 2006Ram 2500 QCSB 4x4, 3" Carli coils w/ 1" Daystar spacer, ... Still ran good tho, dispite the exact conditions you describe on Cold Start up.
The radio and cruse are probably the steering wheel connector . Cannot remember the name but it conects the control buttons to the harness that is if you have cruse and radio controles on the wheel also the transmition has issues in those years but I have found that it is often caused by sensors TPS sensor , will cause irratic shifting also check your fuses for any bad ones this can cause your reader not to work . I love the Cummons engine but hate Dodge trannys I own a Duramax because of the Alison tranny if they made a Cummons Alison combo truck that would be sweet good luck
The power steering pump is piggie backed to the vacuum pump. The seal in the back of the vacuum pump has engin oil under presure behind it cousing a leak that gets worse over time. Cummins make a seal kit to fix this leak.
The pump is located on the passenger side of the engine compartment, back by the firewall. Look in the middle of the firewall by the cowl and you'll see a small plastic line going into the cowl. follow it back and you will come to a T fitting. Follow it to the passenger side and it will go into the Vacuum pump that controls the Cruise control.If you follow it to the other side, it goes under the Battery box. this is where the Servo for the cruise is located. Check the lines for small cracks, wear spots or even breaks. The plastic line can get beaten up pretty easily. The easy way to see if it is your vacuum pump, turn the key on and listen. you will hear 2 distinct sounds. The first sound will stop in about 15 - 20 seconds. (fuel pump?) the second sound is the vacuum pump. If it turns off in 45 seconds to a minute (or slightly longer) the vacuum pump is probably ok, as are the plastic lines. The sound of the pump stopping means that vacuum has been achieved and is holding vacuum. If it keeps running, the pump is bad or the lines have a break in them. If the lines have had a hole in them for a long time, the diaphragm in the pump will have gone south. This is not a servicable part and the pump will have to be replaced. The pump is available from a dodge dealer but most likely the parts guy will not have a clue as there is no picture in their manual and a very poor description. When talking to them ask for a "03 Ram 2500 CUMMINS Cruise vacuum pump" The part costs $212.70